Toward a Unified Understanding of Radio Emission from Novae

Details Toward a Unified Understanding of Radio Emission from Novae Toward a Unified Understanding of Radio Emission from Novae

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934823j&link_type=abstract

American Astronomical Society, AAS Meeting #219, #348.23

Astronomy and Astrophysics

Astronomy

Scientific paper

The radio continuum emission from novae is thought to arise predominately from thermal bremsstrahlung, which is relatively easy to model and interpret physically. However, highly sensitive and more frequent and earlier sampling methods used in the observations of recent galactic novae using the Expanded Very Large Array (EVLA) show startlingly different results from previous observations, and cannot be modeled using the previous simplistic models. To explore the apparent discrepancy between the new EVLA data and previous observations, we present a complete collection of all historical radio observations of novae. This allows us to make comparisons which help determine if the observed deviations are due to fundamental physical differences, or are simply a function of the more frequent and better-sampled newer data. Thirteen multi-frequency data sets are included in the collection: nine from a literature search and four from the VLA archive. The nine published novae were fitted to the simple model of expanding spherically-symmetric thermal shells -- three of which had no prior model fit performed. We conclude that some of the deviations from the simple model seen in the new data may be present in the older data sets; however, there is both too few data and large errors on much of that data for any of these results to be conclusive. We discuss possible model modifications that could be made and provide suggestions for future observations of novae which could provide better clues into the true nature of nova outbursts.

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